/*
 * Created by hangangqiang on 2020.04.17.
 */
#ifndef LEETCODE_QUESTION_REGISTER_H
#define LEETCODE_QUESTION_REGISTER_H

#include <map>
#include <string>
#include <memory>
#include "problem.h"
#include "common/error_code.h"

typedef std::unique_ptr<Problem> (*ProblemCreator)();

class ProblemRegister {
 public:
  ~ProblemRegister() = default;

  static ProblemRegister *GetInstance();

  ProblemCreator GetCreator(ProblemType type, const std::string &question_id);

  void RegCreator(ProblemType type, const std::string &question_id, ProblemCreator creator);

 private:
  ProblemRegister() = default;

 private:
  std::map<std::pair<ProblemType, std::string>, ProblemCreator> creators;
};

class ProblemRegHolder {
 public:
  ProblemRegHolder(ProblemType type, const std::string &question_id, ProblemCreator creator);

  ~ProblemRegHolder() = default;
};

#define RegProblem(type, id, creator) static QuestionRegHolder g_##type##id##QuesRegHolder(type, #id, creator)
#define RegLeetCodeProblem(id, creator) static ProblemRegHolder g_##LeetCode##id##QuesRegHolder(kLeetCode, #id, creator)
#define RegCodeForcesProblem(id, creator) \
  static ProblemRegHolder g_##CodeForces##id##QuesRegHolder(kCodeForces, #id, creator)
#define RegHuaweiProblem(id, creator) static ProblemRegHolder g_##Huawei##id##QuesRegHolder(kHuawei, #id, creator)
#define RegOthersProblem(id, creator) static ProblemRegHolder g_##Others##id##QuesRegHolder(kOthers, #id, creator)
#endif  // LEETCODE_QUESTION_REGISTER_H